def getMaxXLimit(self, x_max, data_type):
"""Returns the provided x_max value if the internal x_max value is None. Converts dates to numbers"""
if self._x_limits[1] is None:
x_limit = x_max
else:
x_limit = self._x_limits[1]
if not x_limit is None and data_type == "time" and not isinstance(x_limit, time_t):
x_limit = time_t(long(round(x_limit)))
return x_limit